Efficient Fabrication of Intrinsic-Josephson-Junction Terahertz Oscillators with Greatly Reduced Self-Heating Effects

Kashiwagi, Takanari; Yamamoto, Takashi; Minami, Hidetoshi; Tsujimoto, Manabu; Yoshizaki, Ryozo; Delfanazari, Kaveh; Kitamura, Takeo; Watanabe, Chiho; Nakade, K.; Yasui, T.; Asanuma, K.; Saiwai, Y.; Shibano, Yuji; Enomoto, Takahisa; Kubo, Hiroyuki; Sakamoto, Kazuki; Katsuragawa, Takuya; Marković, Božidarka; Mirkovic, Jovan; Klemm, Richard A.; Kadowaki, K.

doi:10.1103/physrevapplied.4.054018

Cited by 58 publications

(78 citation statements)

References 92 publications

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“…The reported here ten-fold frequency tunability 1–11 THz is by far more superior to that achieved in semiconductor quantum cascade lasers 5–8 . In contrast to the frequency comb method of tuning of such lasers 7 , in which the overall emitted power is spread over the entire frequency comb, in our case practically all the emission power is concentrated in the (single) primary Josephson frequency with only a minor fraction going to higher harmonics 20,27 . Therefore, superconducting THz sources are superior in terms of tunability because the extreme broad range tunability of the primary frequency occurs without loss of radiation efficacy.…”

Section: Discussionmentioning

confidence: 67%

“…Such an efficacy (ratio of the emitted to the consumed power) is comparable to that for large Bi-2212 mesas 11,12,16,17,20 . We note that this is only an order of magnitude estimation due to roughness of calibration of the absorption efficiency.…”

Section: Methodsmentioning

confidence: 80%

“…A significant sub-THz emission has been reported from large Bi-2212 mesas 11,12,16–18 . But further enhancement of the emission power and frequency is hindered by Joule heating 17,18 , which limits the bias voltage and the primary (first harmonic) oscillation frequency 18–20 .…”

Section: Introductionmentioning

confidence: 99%

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Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Borodianskyi

Krasnov

2017

Nat Commun

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Mesa structures made of Bi2Sr2CaCu2O8+δ high-temperature superconductor represent stacks of atomic scale intrinsic Josephson junctions. They can be used for generation of high-frequency electromagnetic waves. Here we analyze Josephson emission from small-but-high mesas (with a small area, but containing many stacked junctions). We have found strong evidence for tunable terahertz emission with a good efficacy in a record high-frequency span 1–11 THz, approaching the theoretical upper limit for this superconductor. Emission maxima correspond to in-phase cavity modes in the mesas, indicating coherent superradiant nature of the emission. We conclude that terahertz emission requires a threshold number of junctions N ~ 100. The threshold behavior is not present in the classical description of stacked Josephson junctions and suggests importance of laser-like cascade amplification of the photon number in the cavity.

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Section: Discussionmentioning

confidence: 67%

Section: Methodsmentioning

confidence: 80%

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Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Borodianskyi

Krasnov

2017

Nat Commun

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“…The present stand-alone mesa sandwich structures have high heat-exhaust efficiency due to the surrounding sapphire and copper plates with high thermal conductivity. As a result, this stand-alone type of IJJ-THz emitter can generate radiation from 0.3 THz to 2.4 THz by changing the bias point and the bath temperature444652. We note that the thicker mesa has more layers for THz radiation, so that it is in general expected to have stronger THz radiation.…”

Section: Resultsmentioning

confidence: 88%

Applications using high-Tc superconducting terahertz emitters

Nakade

Kashiwagi

Saiwai

et al. 2016

Sci Rep

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Using recently-developed THz emitters constructed from single crystals of the high-Tc superconductor Bi2Sr2CaCu2O8+δ, we performed three prototype tests of the devices to demonstrate their unique characteristic properties for various practical applications. The first is a compact and simple transmission type of THz imaging system using a Stirling cryocooler. The second is a high-resolution Michelson interferometer used as a phase-sensitive reflection-type imaging system. The third is a system with precise temperature control to measure the liquid absorption coefficient. The detailed characteristics of these systems are discussed.

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“…For comparison, the tunability of a single RTD source is 5% at best [19]. Previous studies have shown that the thermal management of emitting sources is a key requirement for controlling their characteristics [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34]. Previously, radiation above 1 THz was achieved by an improved cooling technique [27].…”

Section: Introductionmentioning

confidence: 99%

Engineering and characterization of a packaged high-T_csuperconducting terahertz source module

Tsujimoto

Doi

Kuwano

et al. 2017

Supercond. Sci. Technol.

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We present an effective engineering technique for compactly packaging high-T c superconducting continuous-wave terahertz source modules. A terahertzemitting device, which consists of stacks of intrinsic Josephson junctions in single crystalline Bi 2 Sr 2 CaCu 2 O 8+δ , bias electrodes, a collimating lens, and other components, is packaged into a single finger-sized assembly. The rigid and stable structure used for the packaging guarantees physical and chemical stability with good thermal contact, and provides reproducible characteristics with a high yield rate. The coherent terahertz waves can be emitted from the back side of the base crystal without significant screening. The intuitive results obtained from the numerical simulation are consistent with the observed thermal properties. The modules are easy to use, and thus intended for all users unfamiliar with superconducting electronic devices.

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Efficient Fabrication of Intrinsic-Josephson-Junction Terahertz Oscillators with Greatly Reduced Self-Heating Effects

Cited by 58 publications

References 92 publications

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Applications using high-Tc superconducting terahertz emitters

Engineering and characterization of a packaged high-T_csuperconducting terahertz source module

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Efficient Fabrication of Intrinsic-Josephson-Junction Terahertz Oscillators with Greatly Reduced Self-Heating Effects

Cited by 58 publications

References 92 publications

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Applications using high-Tc superconducting terahertz emitters

Engineering and characterization of a packaged high-Tcsuperconducting terahertz source module

Contact Info

Product

Resources

About

Engineering and characterization of a packaged high-T_csuperconducting terahertz source module